Author: mav
Date: Sat Aug 23 17:31:56 2014
New Revision: 270423
URL: http://svnweb.freebsd.org/changeset/base/270423
Log:
Restore pre-r239157 handling of sched_yield(), when thread time slice was
aborted, allowing other threads to run. Without this change thread is just
rescheduled again, that was illustrated by provided test tool.
PR: 192926
Submitted by: e...@vangyzen.net
MFC after: 2 weeks
Modified:
head/sys/kern/sched_4bsd.c
head/sys/kern/sched_ule.c
Modified: head/sys/kern/sched_4bsd.c
==============================================================================
--- head/sys/kern/sched_4bsd.c Sat Aug 23 17:19:21 2014 (r270422)
+++ head/sys/kern/sched_4bsd.c Sat Aug 23 17:31:56 2014 (r270423)
@@ -982,7 +982,8 @@ sched_switch(struct thread *td, struct t
sched_load_rem();
td->td_lastcpu = td->td_oncpu;
- preempted = !(td->td_flags & TDF_SLICEEND);
+ preempted = !((td->td_flags & TDF_SLICEEND) ||
+ (flags & SWT_RELINQUISH));
td->td_flags &= ~(TDF_NEEDRESCHED | TDF_SLICEEND);
td->td_owepreempt = 0;
td->td_oncpu = NOCPU;
Modified: head/sys/kern/sched_ule.c
==============================================================================
--- head/sys/kern/sched_ule.c Sat Aug 23 17:19:21 2014 (r270422)
+++ head/sys/kern/sched_ule.c Sat Aug 23 17:31:56 2014 (r270423)
@@ -1857,7 +1857,8 @@ sched_switch(struct thread *td, struct t
ts->ts_rltick = ticks;
td->td_lastcpu = td->td_oncpu;
td->td_oncpu = NOCPU;
- preempted = !(td->td_flags & TDF_SLICEEND);
+ preempted = !((td->td_flags & TDF_SLICEEND) ||
+ (flags & SWT_RELINQUISH));
td->td_flags &= ~(TDF_NEEDRESCHED | TDF_SLICEEND);
td->td_owepreempt = 0;
if (!TD_IS_IDLETHREAD(td))
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